Merge remote-tracking branch 'dotnet/master' into merge-master-nullable

Commit migrated from https://github.com/dotnet/coreclr/commit/6f09caabfaafdba11df45aa84e02d26ed6732f0c

diff --cc src/coreclr/src/System.Private.CoreLib/System.Private.CoreLib.csproj
Simple merge

diff --cc src/coreclr/src/System.Private.CoreLib/src/Internal/Console.cs
Simple merge

diff --cc src/libraries/System.Private.CoreLib/src/System/Threading/WaitHandle.cs
Simple merge